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. 2025 Mar 17:47:e-rbgo5.
doi: 10.61622/rbgo/2025rbgo5. eCollection 2025.

Accurate evaluation of mode of delivery and labor progression with angle of progression: a prospective cross-sectional

Huong Lam Le  1 , Huy Vu Quoc Nguyen  1 , Tam Minh Le  1 , Lam Hoang Vo  1
Affiliations

Accurate evaluation of mode of delivery and labor progression with angle of progression: a prospective cross-sectional

Huong Lam Le et al. Rev Bras Ginecol Obstet. .

Abstract

Objective: To determine the validity of the angle of progression (AoP) in predicting delivery mode among women in the second stage of labor.

Designs: This prospective cohort study was conducted at the Obstetrics and Gynecology unit (OBGYN) of two hospitals in Vietnam. Transperineal ultrasound was performed for each woman to measure the progression angle in the second phase of labor. data were collected from.

Participants: A total of 725 women with singleton pregnancies with cephalic presentation at term.

Methods: Transperineal ultrasound was used to measure the angle of progression in the second labor phase and to identify the delivery method.

Results: The rate of vaginal birth in women with an AoP ≥ 120° on transperineal ultrasound was 70.2%. The optimal cutoff point of AOP ≥122° with sensitivity and specificity for vaginal birth were 87.8% and 80.7%, respectively the area under the ROC curve of 0.887 (p<0.0001). The study's sample size was restricted owing to deficiencies in resources and time.

Conclusion: The likelihood of achieving spontaneous vaginal delivery can be predicted by the angle of progression measured with transperineal intrapartum ultrasonography during the second stage of labor in women.

Keywords: Cesarean section; Delivery, obstetric; Labor stage, second; Pregnancy; Ultrasonography.

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Conflict of interest statement

Conflicts to interest: none to declare.

Figures

Figure 1
Figure 1. ROC curve analysis for the angle of progression. AuROC for the prediction of the mode of delivery was 0.867, 95% CI (0.86 - 0.91), P < 0.0001
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